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"""About Dialog for IDLE

"""
import os
import sys
from platform import python_version, architecture

from tkinter import Toplevel, Frame, Label, Button, PhotoImage
from tkinter import SUNKEN, TOP, BOTTOM, LEFT, X, BOTH, W, EW, NSEW, E

from idlelib import textview


def build_bits():
    "Return bits for platform."
    if sys.platform == 'darwin':
        return '64' if sys.maxsize > 2**32 else '32'
    else:
        return architecture()[0][:2]


class AboutDialog(Toplevel):
    """Modal about dialog for idle

    """
    def __init__(self, parent, title=None, *, _htest=False, _utest=False):
        """Create popup, do not return until tk widget destroyed.

        parent - parent of this dialog
        title - string which is title of popup dialog
        _htest - bool, change box location when running htest
        _utest - bool, don't wait_window when running unittest
        """
        Toplevel.__init__(self, parent)
        self.configure(borderwidth=5)
        # place dialog below parent if running htest
        self.geometry("+%d+%d" % (
                        parent.winfo_rootx()+30,
                        parent.winfo_rooty()+(30 if not _htest else 100)))
        self.bg = "#bbbbbb"
        self.fg = "#000000"
        self.create_widgets()
        self.resizable(height=False, width=False)
        self.title(title or
                   f'About IDLE {python_version()} ({build_bits()} bit)')
        self.transient(parent)
        self.grab_set()
        self.protocol("WM_DELETE_WINDOW", self.ok)
        self.parent = parent
        self.button_ok.focus_set()
        self.bind('<Return>', self.ok)  # dismiss dialog
        self.bind('<Escape>', self.ok)  # dismiss dialog
        self._current_textview = None
        self._utest = _utest

        if not _utest:
            self.deiconify()
            self.wait_window()

    def create_widgets(self):
        frame = Frame(self, borderwidth=2, relief=SUNKEN)
        frame_buttons = Frame(self)
        frame_buttons.pack(side=BOTTOM, fill=X)
        frame.pack(side=TOP, expand=True, fill=BOTH)
        self.button_ok = Button(frame_buttons, text='Close',
                                command=self.ok)
        self.button_ok.pack(padx=5, pady=5)

        frame_background = Frame(frame, bg=self.bg)
        frame_background.pack(expand=True, fill=BOTH)

        header = Label(frame_background, text='IDLE', fg=self.fg,
                       bg=self.bg, font=('courier', 24, 'bold'))
        header.grid(row=0, column=0, sticky=E, padx=10, pady=10)

        tk_patchlevel = self.tk.call('info', 'patchlevel')
        ext = '.png' if tk_patchlevel >= '8.6' else '.gif'
        icon = os.path.join(os.path.abspath(os.path.dirname(__file__)),
                            'Icons', f'idle_48{ext}')
        self.icon_image = PhotoImage(master=self._root(), file=icon)
        logo = Label(frame_background, image=self.icon_image, bg=self.bg)
        logo.grid(row=0, column=0, sticky=W, rowspan=2, padx=10, pady=10)

        byline_text = "Python's Integrated Development\nand Learning Environment" + 5*'\n'
        byline = Label(frame_background, text=byline_text, justify=LEFT,
                       fg=self.fg, bg=self.bg)
        byline.grid(row=2, column=0, sticky=W, columnspan=3, padx=10, pady=5)
        email = Label(frame_background, text='email:  idle-dev@python.org',
                      justify=LEFT, fg=self.fg, bg=self.bg)
        email.grid(row=6, column=0, columnspan=2, sticky=W, padx=10, pady=0)
        docs = Label(frame_background, text='https://docs.python.org/' +
                     python_version()[:3] + '/library/idle.html',
                     justify=LEFT, fg=self.fg, bg=self.bg)
        docs.grid(row=7, column=0, columnspan=2, sticky=W, padx=10, pady=0)

        Frame(frame_background, borderwidth=1, relief=SUNKEN,
              height=2, bg=self.bg).grid(row=8, column=0, sticky=EW,
                                         columnspan=3, padx=5, pady=5)

        pyver = Label(frame_background,
                      text='Python version:  ' + python_version(),
                      fg=self.fg, bg=self.bg)
        pyver.grid(row=9, column=0, sticky=W, padx=10, pady=0)
        tkver = Label(frame_background, text='Tk version:  ' + tk_patchlevel,
                      fg=self.fg, bg=self.bg)
        tkver.grid(row=9, column=1, sticky=W, padx=2, pady=0)
        py_buttons = Frame(frame_background, bg=self.bg)
        py_buttons.grid(row=10, column=0, columnspan=2, sticky=NSEW)
        self.py_license = Button(py_buttons, text='License', width=8,
                                 highlightbackground=self.bg,
                                 command=self.show_py_license)
        self.py_license.pack(side=LEFT, padx=10, pady=10)
        self.py_copyright = Button(py_buttons, text='Copyright', width=8,
                                   highlightbackground=self.bg,
                                   command=self.show_py_copyright)
        self.py_copyright.pack(side=LEFT, padx=10, pady=10)
        self.py_credits = Button(py_buttons, text='Credits', width=8,
                                 highlightbackground=self.bg,
                                 command=self.show_py_credits)
        self.py_credits.pack(side=LEFT, padx=10, pady=10)

        Frame(frame_background, borderwidth=1, relief=SUNKEN,
              height=2, bg=self.bg).grid(row=11, column=0, sticky=EW,
                                         columnspan=3, padx=5, pady=5)

        idlever = Label(frame_background,
                        text='IDLE version:   ' + python_version(),
                        fg=self.fg, bg=self.bg)
        idlever.grid(row=12, column=0, sticky=W, padx=10, pady=0)
        idle_buttons = Frame(frame_background, bg=self.bg)
        idle_buttons.grid(row=13, column=0, columnspan=3, sticky=NSEW)
        self.readme = Button(idle_buttons, text='README', width=8,
                             highlightbackground=self.bg,
                             command=self.show_readme)
        self.readme.pack(side=LEFT, padx=10, pady=10)
        self.idle_news = Button(idle_buttons, text='NEWS', width=8,
                                highlightbackground=self.bg,
                                command=self.show_idle_news)
        self.idle_news.pack(side=LEFT, padx=10, pady=10)
        self.idle_credits = Button(idle_buttons, text='Credits', width=8,
                                   highlightbackground=self.bg,
                                   command=self.show_idle_credits)
        self.idle_credits.pack(side=LEFT, padx=10, pady=10)

    # License, copyright, and credits are of type _sitebuiltins._Printer
    def show_py_license(self):
        "Handle License button event."
        self.display_printer_text('About - License', license)

    def show_py_copyright(self):
        "Handle Copyright button event."
        self.display_printer_text('About - Copyright', copyright)

    def show_py_credits(self):
        "Handle Python Credits button event."
        self.display_printer_text('About - Python Credits', credits)

    # Encode CREDITS.txt to utf-8 for proper version of Loewis.
    # Specify others as ascii until need utf-8, so catch errors.
    def show_idle_credits(self):
        "Handle Idle Credits button event."
        self.display_file_text('About - Credits', 'CREDITS.txt', 'utf-8')

    def show_readme(self):
        "Handle Readme button event."
        self.display_file_text('About - Readme', 'README.txt', 'ascii')

    def show_idle_news(self):
        "Handle News button event."
        self.display_file_text('About - NEWS', 'NEWS.txt', 'utf-8')

    def display_printer_text(self, title, printer):
        """Create textview for built-in constants.

        Built-in constants have type _sitebuiltins._Printer.  The
        text is extracted from the built-in and then sent to a text
        viewer with self as the parent and title as the title of
        the popup.
        """
        printer._Printer__setup()
        text = '\n'.join(printer._Printer__lines)
        self._current_textview = textview.view_text(
            self, title, text, _utest=self._utest)

    def display_file_text(self, title, filename, encoding=None):
        """Create textview for filename.

        The filename needs to be in the current directory.  The path
        is sent to a text viewer with self as the parent, title as
        the title of the popup, and the file encoding.
        """
        fn = os.path.join(os.path.abspath(os.path.dirname(__file__)), filename)
        self._current_textview = textview.view_file(
            self, title, fn, encoding, _utest=self._utest)

    def ok(self, event=None):
        "Dismiss help_about dialog."
        self.grab_release()
        self.destroy()


if __name__ == '__main__':
    from unittest import main
    main('idlelib.idle_test.test_help_about', verbosity=2, exit=False)

    from idlelib.idle_test.htest import run
    run(AboutDialog)